726514557121 has 4 divisors (see below), whose sum is σ = 735710944000. Its totient is φ = 717318170244.

The previous prime is 726514557107. The next prime is 726514557169. The reversal of 726514557121 is 121755415627.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 726514557121 - 2¹⁵ = 726514524353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (726514557101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4598193321 + ... + 4598193478.

It is an arithmetic number, because the mean of its divisors is an integer number (183927736000).

Almost surely, 2^726514557121 is an apocalyptic number.

It is an amenable number.

726514557121 is a deficient number, since it is larger than the sum of its proper divisors (9196386879).

726514557121 is an equidigital number, since it uses as much as digits as its factorization.

726514557121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9196386878.

The product of its digits is 588000, while the sum is 46.

It can be divided in two parts, 72651455 and 7121, that added together give a square (72658576 = 8524²).

The spelling of 726514557121 in words is "seven hundred twenty-six billion, five hundred fourteen million, five hundred fifty-seven thousand, one hundred twenty-one".